1 #ifndef INT_BLK_MQ_TAG_H
2 #define INT_BLK_MQ_TAG_H
4 #include <linux/percpu_ida.h>
7 * Tag address space map.
11 unsigned int nr_reserved_tags;
12 unsigned int nr_batch_move;
13 unsigned int nr_max_cache;
15 struct percpu_ida free_tags;
16 struct percpu_ida reserved_tags;
19 struct list_head page_list;
23 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node);
24 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
26 extern unsigned int blk_mq_get_tag(struct blk_mq_tags *tags, gfp_t gfp, bool reserved);
27 extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags);
28 extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag);
29 extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
30 extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
31 extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
34 BLK_MQ_TAG_CACHE_MIN = 1,
35 BLK_MQ_TAG_CACHE_MAX = 64,
39 BLK_MQ_TAG_FAIL = -1U,
40 BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
41 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,